body{
    background: url("../images/1.jpg");
    background-size:100%; 
    animation-name:myfirst;
    animation-duration:12s;
    /*变换时间*/
    animation-delay:2s;
    /*动画开始时间*/
    animation-iteration-count:infinite;
    /*下一周期循环播放*/
    animation-play-state:running;
    /*动画开始运行*/
}

@keyframes myfirst
{
    0%   {background:url("../images/1.jpg");background-size:100%;}
    25%  {background:url("../images/5.jpg");background-size:100%;}
    50%  {background:url("../images/6.jpg");background-size:100%;}
    75%  {background:url("../images/4.jpg");background-size:100%;}
    100% {background:url("../images/1.jpg");background-size:100%;}
}

.form{background: rgba(255,255,255,0.2);width:400px;margin:120px auto;}

/*阴影*/
.fa{display: inline-block;top: 27px;left: 6px;position: relative;color: #ccc;}

input[type="text"],input[type="password"]{padding-left:26px;}

.checkbox{padding-left:21px;}

#baoguo{
    margin: 0;
}

#baoguo i{
    float: left ;
}